This function is used to encode a name/value pair. This should be used on any
field being logged that potentially contains a space, a double-quote, or a
control character. Any value containing those have to be specially encoded for
the auparse library to correctly handle the value. The encoding method is
designed to prevent log injection attacks where malicious values could cause
parsing errors.

To use this function, pass the name string and value strings on
their respective arguments. If the value is likely to have a NUL value
embedded within it, you will need to pass a value length that tells in bytes
how big the value is. Otherwise, you can pass a 0 for vlen and the function
will simply use strlen against the value pointer. Also be aware that the
name of the field will cause auparse to do certain things when interpretting
the value. If the name is uid, a user id value in decimal is expected. Make
sure that well known names are used for their intended purpose or that there
is no chance of name collision with something new.